SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3560010cb88fe24fd8e1c471fbb47faf20607a0ecc966d3a1cdd149bfce75ec2' 
  AND token = 'hFaQqP0+H5aKBykjCHMWbzJG5zdig2Q/uCEqD+l8gN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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