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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db27a6e4600c342f6a4d8175c45bda72fec35421636c63d19e34d8988c21ac2e' 
  AND token = 'v9JUTrmNww314IGTFLI9gXt8TAEiz0bMZcu3q2yPn2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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