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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3941ac107b624e1a3f7abe3591e725c947375fb88e4e0d6a076f90c4e3a88d6' 
  AND token = 'xZinTUHOunW3P6fyoMm8AkPg3j4PTBpOf87hanVJYCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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