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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da636dfb9c764ab49f0787468a7a0253de9027367be2976f9624f7315236ef7' 
  AND token = 'tRDh6yRfgQLkpveHQ4B5NEClZ2VB6g5Kx0gmau5cPLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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