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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9d6af66e9cceb1e179dc3cd17b1e7f11aaa585c6f238cee81c8edfd23e44be' 
  AND token = 'q0B3dLcOadMRRQzamx6p7TaPfAJqck9JheRkchHTw7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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