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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd843450c3e228a97ef5edd7a63e25b47b794e5461310de703619597a765166fa' 
  AND token = 'X1ES6YW6vTjnGJcu7Hma2rGs4gVpu2hV3EuUp++HZmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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