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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0270beb0255154b1f1db318290132e7ff15c5ba6ece7387032c6635c0ec1ec87' 
  AND token = '5zAckR2UzkkDweD8hbn2c47vD74b+GLD3/fJAFkhnTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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