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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b90296600c65ef5952342267cd0a4acfe28746eb9ef12bfac3c0ff18fa5c87fe' 
  AND token = 'Wqvk8ME3LYzAqeDk5OdL/OtYKjh++YdV3Od1ntqXIy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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