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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b874e0042cb5e8234e620fa56004e26e217aff44aa01cc2ea24174012754e89' 
  AND token = 'qH9avrifgs1lfz1PlkdC+T4Hw/xzY1+oPgIk3b/m+T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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