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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f03ffbcdc056fe29a56a707064238c4d9e09c2637dc6e202a219e3892963eb' 
  AND token = 'kkFQFc444k4AZ3wiBs5UCe+N+z7WOrkVNRBaXo10sWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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