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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f574c51ce94f7b72b34e6da25d8a4a54a400ca571ae1e0f16d3abdac5b7ce5a6' 
  AND token = '7OPVq1/S5+EvkP9WVoQ3EjxArsDfyiMgNq65rLLWbQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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