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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd93fa43764b233b5805340eb264137b7db24feea5ddb17bb9c3905d1a0e6a3' 
  AND token = 'OBMPNp9hwhKNP1LQDbtN2WlI+8ROoJ6mE0dQS8E6YjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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