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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402c29527d9ef4799becb2443b06c9107ff387fbcfa395c77a1ab437839cf41c' 
  AND token = 'G8lRbOqS50DMn6bWTBZP+JHfpxDHffuW2I9aq24y8GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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