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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a010b9520bc9fb6e13a1992c7983ccdf8eed6d7e814c0d4cfaa0931428cb8fba' 
  AND token = 'VNZ5foYvXQ2NtkZoSKqJG7ZKpRxGjbc9AO0mHceC4EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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