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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ad0b1eacc97c3ae6b8bafeeb1e3cfde69c933fef00fc996b465871f6ce13a0' 
  AND token = 'avM49mKn/Ei1iAKFEWMzwHIOQvC+Wxbb4bSvN8YA/Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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