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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2193daa9b10083bf2ca7c25910f1f46f07a8bf53baca40871102a8c57e778d' 
  AND token = 'zwVtMFMt5tQKNFifn8ufuaiPwYcjve2exH4SpLWPZMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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