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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '358004c53bab9875a4e1dca63a3ecd3d1532c6c1b1f721af9bd963b0600390e3' 
  AND token = '5O0Z+p/7ebDiHnd+qDYcv8xEJTf10ciZwFx6gwCz+E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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