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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca98dc986f68d95b3441888aa773dfae063d6080869b1bef1b68c362c92db846' 
  AND token = '6zFoljDMG2QFIBVV+xcfSmy2gpcka6/jxk2YTDv+O84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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