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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a83b01b2df72c4c92c5094b6e3bc647d51e4bd4d34e0b1483df2533cad8333f' 
  AND token = '1VX2ymQltEHS5jJMsjaQKCHLdLv4P53TXZp1eJtESSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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