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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d6b3de28d4c21243520f7adc75c72445c3ae22e3bdcc064180aec0bae8e69e' 
  AND token = 'KQLGFWsr8uZ+u3SPVJxELwSj2RXy4SR7LGxhV+VQcYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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