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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46be6d34d7807fb6a6eefb649dd38a1cfd99e1226d5f53f7379e5058a4150322' 
  AND token = '03XeuDvWKDIOszXTtgfvJei+ABtSVru8RB3g0rsSkB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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