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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5734940fb956c6bde780052e03324b6abf272c97fbf51d84dab746ef0400d162' 
  AND token = 'M0U365rPhYr+8IPK+om1Suq8CXFc70pkKWYbdKc2EZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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