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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faee8060aec10440a35ff4f2b2b75c813fbf874f898f4d35ebd247a3f12ee2b6' 
  AND token = 'geSsfhdy8VBdZgMOoZYK++T3v1+amZ1t9NI9A55Xnac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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