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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2214444dd27d307baf759b3d153d03cd2ff4fee0cb0f8901eed1741a7e838e' 
  AND token = 'I7VjiwOYjynKPg2pDd8uOokqJuBUS9dJxUi3JZ2sT1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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