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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26205ef12ada7dba48acde4024b98a24302872c1f44a4170ba9558e4c423e0b6' 
  AND token = '0iLt2K9pfjDKrcBiu5QxcTPk/kWU3cAcziBIlWn4sZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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