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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b52692d704665d8da82579f4317fbb590754f0883348f110ca4cb41f51f4a759' 
  AND token = 'B3zH6NAY62Rd1ln08k899Htz2IOApqaDsqlT/m0IfIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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