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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc5f2c6ab53182eb09db45c5077ce7af54f1ecc9bbc24a903908b866b26c652f' 
  AND token = '3aasA1Y7PzY2spwOLJPPkP7tUyPim5qKlZWX50PScaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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