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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76081c94cd9c2ac94514bf0ae39db352e0ad30740d297d522422e7b8a3ba47cb' 
  AND token = '3Q6onz47mPNFkcF+H0nYVpf1JdxXkSTFQAUJjbHIVy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}