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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2dd23dc3e0fc3ce902dde1031add476a0c5035995994206c1791f3d20922d3f' 
  AND token = 'QEVRcth11znbnPSftKCoZcg04MLEIrF/4QLsUJO0Ebc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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