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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2f1d53047543761ea4613bca084ec07424718f67c4293fd16fe7d18e329f6a' 
  AND token = 'WCz+sAryNpqbXIcX6dQ18LxI5uNK53Fhoo6GTVC+A+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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