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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '417c21f095305a3bb99b54c8768af654cfd0392858e300062a4b01bc14025924' 
  AND token = 'RevR7kOj2XbQRIMzyM27RW3ePYwP+SSCWk22qliNGyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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