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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca12f130e50f7d5099c7729480e4402c43e74047dd67ecf3f8e1d59310227785' 
  AND token = '+DY7juOUl4BcT1RpItsnxaD5TDGc0bwik4/1kwl6WGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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