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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d4e90597f743d807cc84258fdbec2ce5e50b60b469280a31e7c5a9a9902354d' 
  AND token = 'WrDbDrP3A1HYuMlvgu7rxade9wij9+sslCaG6gZJQYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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