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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31df8f2eb8f19451b9eb34d98001fe6c5394b64617e6bb0001d269d821d90d47' 
  AND token = 'ejvwokuVGrPT2Y5cvAjZCl20ssNrz0ShTSGVIcSYYgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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