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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff1203584b79f3123792b24c89f2bf1ac58b5a670549da21423acead96c4133a' 
  AND token = 'sJ1da5JhV9KaPt1Y1fT924OwiiCeibKa/5LMQVosjKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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