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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '425a73c9aeb90b36719b42de63caafb842763c4e0016e27380006eb5e69ea382' 
  AND token = '5aW+uVXbr4ZGNFgbTIP85JRtpvKfZXacVqb/8KkxM2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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