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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68b0ffa18af703c808ed032447ec4314c471c7b9ce46f858efe5ca638314fb2c' 
  AND token = 'K1PEIWG9YJdYbRUTnVpt2CUMu1I5oiLjDAhm0FEHxiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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