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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4511254c0a4059dee492e739fecdc85bdee7e498ba22a88b1bfb15ad14ae760' 
  AND token = 'mD9c28NX7wO6dwd7nnNqE8jvZiooGXQMWfUaTHocS9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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