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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eaed18cbbb8df2ceee3c08c2152502647ad17043379401ea70598f13a11b8df' 
  AND token = 'f4iYx+25+gdqcdQnlosEyiL0EeJJEI9DxzY24+t7Y+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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