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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d15ad9b7a7c7583cadc231b0406dd6ac31a137375bf2e21916bf0eef341832' 
  AND token = 'FJXvJGNXwoFMvCynvH9w+b4R4EaMX+aA19BNDNBy3cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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