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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d5ed9b44b5ba6ddffc253f0ca1e01d35afc433b301c359f270d2943f91dcec' 
  AND token = '0lUr8OLMXzcGEaXB7fDgPGM2O1c5DZr+Zy0BwNiGn0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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