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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8563cd25621f7be67b239d756bf92982489c0f722219cece183a913435325753' 
  AND token = 'L2lG+bOLiH8OhyfWppxZ9fHy5YF01QKBiUDDQ7LGaWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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