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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d63c7f358a29e928d7aec84549fe9f73c0834db56ca798b6d6b6d1e50ea962f' 
  AND token = '6x2L6v8i6Ad5S+dwpp7z6aYV357IXz6xXQeCgK8GlNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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