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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f76d108025f9d678689116ae786c58e68c7e612b447233378d4fcd231b2de8' 
  AND token = 'm7QQOpkcn5GgamAh9OaTLcI3gfXvl0lOhT5q0RqQUyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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