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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0746b2b37df65d3aff1b3ed13f9c0067c2ff3e4bf62893931bd4de61708af26' 
  AND token = 'jbznBHQMC1iV7Uf3TZ3xoMpSkijN6FXt7u89MN/ovYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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