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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f786396b4c9e573e0424c64df2b0aaf6f5af16cd164a3518290934fd3fdbf764' 
  AND token = 'y84a2fmTAw+/UiH/zEP6+q2GFcCJIGgc3UEUBGyIU3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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