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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fad2ed5718dfbdea20910ccfd5bbed0301a74ad70a7442177dc612d52227b1c' 
  AND token = 'dS6jFXAksTBrtve1A2OcnadY0uP8aiX03KG0pfXDl60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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