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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b49bed3e7a44be5b0688f47ee6830ecdba9beeb0868deeab77ef4b56943acf2' 
  AND token = '4G31ThNmUtJdCvSmdUoqj8QR1Ri3vIxNk1b97RIQX5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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