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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994e4650086433b285a68a5e69a37f4db68e0add68f700561487f1b479f51267' 
  AND token = 'sI+wNNC43DswxptpnHS/EqpIC7gPX4VDI1o9vy5mZTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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