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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc7ed8f2e58e462c5f53b8e548bb6a7080e8975d4bc4f9df57914700960f119' 
  AND token = 'dksvqG5SXJlkZoFGFzcXviIldvP210DGPtefhcVcsSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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