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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebaf22fb9bf92abc9dad542b481d425432fe73bb0601ee6f5e6bb44d3c41f0d' 
  AND token = 'HGYJmWlkRMsyiEFN1Z0PTZd/erY2BNc3HaT0ncti9qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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