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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a95df4d0036d1361d563add1087171cba31719be59e24f6048e55c85ee677c1' 
  AND token = '6dfsv3HgZZ9zvwkMS5VWPqaG9Q75yVxf7Ha4Y6llQnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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