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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860c15934241fcb8de45abba2e7f8b661116b293397cdc367f04116aa90714f5' 
  AND token = 'KhxfpKbLD+1PLXs9DuubiJVMV66foJpW8jypgcfGUCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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