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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f785fb2e775679289eb3f8a0066c9e71de23fc49aef3a09bfb9bff952b6f62' 
  AND token = 'HAetSK5KH28YwSwHRx6c5YNe1U0Elf18//vedLamsUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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