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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f588f22cf5adab484b1cf930a70b8559ad0b2c157b9544c49a020a77f53b1d8' 
  AND token = 'ht1osUfrBxxJTSfiQ/l7mZ2KyOengvMLgCfUzATqC7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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