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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f6e2163a77ce644a7c18b32f584aee3536ed53d79530d33bd9a749a51ef4002' 
  AND token = 'xhQPkSlpXQu8F9q3/lGxA4ovAZXkN/65CjmWCqkO4nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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