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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fea3d86f8e852067cc6fe800d14b5cd0233756c55b4769814d30fef0fef4140' 
  AND token = 'BdLpm0o+g7cEl/59ixpRHeHobanIDyH2lOKVjDuBs34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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