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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b058b37b71dd82dc95fa410c541611ef1e447b5f0332b628d2b0874a11f53138' 
  AND token = '6+2FAiJtdXejjWbgW9mijvhjyPLHNWRw9OYF9Av/7C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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