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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0bef19ac77abc129bfb3196641155592790e569ba1f9fea2ad9b6b0771ac687' 
  AND token = 'reWuUNaQ2HxdG1I+2siiy4NMkfaEpztxG8gmKo9RMEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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