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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd98246d08bee78ae505d47f212269df7884b2600bc8bfad60963ba35b8be88' 
  AND token = 'mnhJFe6QZjbYHLlXOyitQ7I/pV3QBJZjWZpUan8Ed3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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