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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '017bd176da0e3cd05182b975c38994f5c50b55a8a6642550f23e57b40a7eff1b' 
  AND token = 'L3sBEg1+Cuv69CtYxTh0RarClnJPLJNjAd2Eejj+z7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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