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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf662331a1ddda0012a80395677ad535550403af4e124fb21e0266f3b2d7cfa2' 
  AND token = 'RRYpWn/N2yyONp61EJ5OWF66u1xnwcw0LFIZiLvzswg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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