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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecee9006eb693f3b8d4e3c62d7a993cbafed8554ae30258a95ef507f6f5b10b6' 
  AND token = 'YcUKtkTNLLLfZ78x9KvPX2a8EdvEkuLt7FrBZBUnvtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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